All the the Nortel Tbolts had DOCXO but not the regular Tbolts or the 1/2
Tbolts that have been purchased through time-nuts (though they are nice
too). A few lucky people got the ATT bolts (VERY RARE) which have the
nice OCXO too but with extra stuff on the board.
These nortel tbolts are
It's a double oven oscillator (vectron I believe) as opposed to the 1/2
tbolts that only have a single oven that everyone else has from the 911
units.
This one has other additional features like full power supply conditioning
(just add 48v power supply) and can have firmware upgraded.
Does anyone have a double-oven thunderbolt like the one that's now listed on
ebay? If so, do you have any phase-noise or other performance data on it?
-Flavio
___
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Where did you get the batteries?
- Original Message -
From: Stanley Reynolds [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Friday, May 16, 2008 14:11
Subject: [time-nuts] Dranetz meter
Found what I considered a deal on a 646 Dranetz meter, it has plenty of
inputs, 3 phase, single
I think you did great!
It's too bad you didn't have more time (ironically) to talk about other
stuff. I never heard these Bryant Park people before but they sound more
like ipod techies more than, true, engineering techies-- it's all good
though.
- Original Message -
From: Tom Van
How much do you want for each and/or all three?
-Flavio
- Original Message -
From: Chuck Norton [EMAIL PROTECTED]
To: Time Nuts List Time-nuts@febo.com
Sent: Saturday, March 31, 2007 00:06
Subject: [time-nuts] HP 5087As for sale
I have 3 of the HP 5087A Distribution amplifiers that I
Like jshank, it is a real buyer beware sort of deal even if you can
inspect things in person. If you have a problem, the customer service is
the worst! You have to wait two weeks for an answer sometimes. Even if
your dispute is serious, you may not even have a chance to appeal their
I don't think an 8 channel board will work with a Z3801A.
-Flavio
- Original Message -
From: Don Garlick [EMAIL PROTECTED]
To: time-nuts@febo.com
Sent: Friday, March 09, 2007 17:37
Subject: [time-nuts] Need some help with Motorola Oncore VP Back in
Binarymode
Hello I need a little
Think it's up on Agilent's website.
- Original Message -
From: John Ackermann N8UR [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
time-nuts@febo.com
Sent: Saturday, March 03, 2007 10:04
Subject: [time-nuts] HP 5087A manual -- or gain adjustment instructions?
Actually, from what I understand there is no power conditioning board. A
regular Thunderbolt has two boards. A processing board and a power
conditioning board stacked on top of each other. The power condition board
is whole bunch more that just a DC-DC converter. These 1/2 Thunderbolts
Pins 1 and 5 on each unit control the failover functionallity. If you
disconnect them entirely on both the XO and RB units, both units will be in
ON mode. But it will be interesting to see what happens when it goes only
one way.
- Original Message -
From: John Ackermann N8UR [EMAIL
1. Same test with a Fluke 6680 yeilds 10MHz mean exactly.
2.Tried different length cables and swapping the cables. Same result.
3. Autocal was done (a few times)
- Original Message -
From: Tom Van Baak [EMAIL PROTECTED]
To: Discussion of precise time and frequency measurement
I read the same spec on pg 63 but I read it as a fluctuation not an offset.
I'm curious if you try the test Bruce suggested and set the gate time to
0.1s and then 0.01s and see if the offset increase by a factor of 10 for
each change?
I'm finding it hard to believe that this top of the line
Ulrich wrote
that even with an external time base connected
this calibration byte stays active and that you have to set it by hand
I tried it, but on my unit calbyte 4 does not have an effect when the
external timebase is connect, unlike yours.
-thank Flavio
- Original Message -
Bob,
I see what your saying about the frequency error spec on pg vii, but I'm
still reading as a fluctuation not an offset of the mean. In my mind, I
don't see why there should be some sort of adjustment for this. I really
doesn't make sense that the would make a counter that doesn't display
I have been able to correct the offset problem. The solution fixed the
offset problem for both channels A and B and all gate times.
I've have written to SRS tech support to ask them if my solution is
correct. I will post the solution once they reply-- I don't want people to
start playing
I have an SR620 counter that I set up with a Z3801A as an external reference.
If I put a bnc T connector at the output of the Z3801A and use two equal length
bnc cables, one to the ext. ref input on the back and the other to channel A
then do a frequency measurement, I get a mean that is about
Your SR620 is well within its specifications, the tolerance for this
test is -0.0035 Hz to + 0.0035 Hz.
The readings fluctuate by that amount, but the mean is still off by -0.00150
Hz.
Changing cable length...
Tried it, no difference.
25Ohm load with two terms
Tried all variations of
Here's a thought. Perhaps there is a problem with the rear reference input;
A and B channels are fine since they read the same error. The question is
Is there a way of adjusting the Reference Input so that it correctly read
the 10Mhz input?
I tried the same setup with my other counter and it
...if my model is correct the apparent offset in the
mean will be increased by a factor of 10 over that for a a 1 second gate
time.
Bruce
Looks like you're right Bruce. I did both 1, 0.1 and 0.01 gate times and
the error increased by a factor of 10.
And it doesn't sound like this is a
I got similar results in that the rb oscillators are not GPS disciplined
after a 72 hr run.
I started off by manually offsetting the frequency of a warmed up rb unit by
doing a manual adjustment to the rb oscillator via the manual adjustment pot
so that it would be approximately 0.0050Hz off
It is not unlikely that there is a DAC for that voltage so that
factory and field calibrations can be done from a remote location.
I'm not sure in this case. Lucent put an awful lot of stuff in the RB unit
for it to be just green light.
___
I traced out where most of the interface connections went to. I don't
remember exactly what I found out, but I remember it was rather straight
foward so I'm leaning towards it being a simple cross over. What I'm not
sure about is the logic that selects the XO or the RB to be ON. But I'm
I saw the vendor put up new pictures of the Thunderbolt that he has
hundreds of up in his auction . The pictures aren't very clear but it looks
as though HALF of the Thunderbolt is missing. There doesn't seem to be
any power conditioning board. Am I wrong about this?
- Original
**That's a big problem if there is no power conditioning board. ** The DC-DC
converter is very expensive itself and there is A LOT of filtering before it
AND that's all after a DC input!!! I saw somebody suggested a cheap
switching power supply as a power source, but that will not be
have to pay (though I think anyone here would be willing to list a low
value
as a gift to help minimize those costs).
The problem is that if your sending that many at once, customs will get
suspicious about the cost AND do you really want to send that many without
being properly insured .
There are different hardware variations of the Thunderbolt out there. There
is the commercially available Thunderbolt which available from Trimble that
everyone is familiar with, and then there are the industrial versions that
are made for the telecoms. The Andrews E-911 version,
John Miles wrote:
People with Z3801As tend to fiddle with them until the
cows come home in my experience, and that's fine if that's what you're
into,
but... wait, what list is this again? :)
I put my info and experience with Thunderbolts out there for the NUTS in
this mail list. I have a few
Take note that it is a very short auction-- 3 day. I would interpret this
as the seller trying to do a quick test of the waters--possible nervousness.
Note, no minimum bid yet. I still contend there is no market for these
items at this price. Only people who don't follow this group will be
Someone just posted Thunderbolt type boards for $275 on ebay. Claims might
have a better oscillator then stock Thunderbolt and 5 10mhz outs + power
supply. Still a good deal. Only three though.
- Original Message -
From: Robert Deliën [EMAIL PROTECTED]
To: Discussion of precise time
I had the exact same problem as yours. I discoverd that my 106B had a
6-channel board in it vs. the 8-channel that is supposed to be in there.
I put a 8-channel board in and the fault and GPS lights went out.
- Original Message -
From: Robert E. Martinson [EMAIL PROTECTED]
To:
Fair enough. I just thought they're pricing strategy kind of funny (and I
don't mean funny-ha-ha).
It seems the price suddenly went up $100 as soon as some posts some progress
on time-nuts.
If you don't want me to continue this thread, I won't. It just seems
they're taken advantage of your
I saw the $20 thing, more weirdness.
Anyway, that's wasn't my point. That post said that they have only two RB
units left, but eleven are up on ebay?!?!
- Original Message -
From: Jason Rabel [EMAIL PROTECTED]
To: 'Discussion of precise time and frequency measurement'
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